lúsina adj. "glowing" (of things), "hearty" (of people) (QL:57). If this word is to be used in LotR-style Quenya, one would have to assume that it represents older lúþina and is derived from a root LUTH.
Beware, older languages below! The languages below were invented during Tolkien's earlier period and should be used with caution. Remember to never, ever mix words from different languages!
lúsinaadjective. warm, glowing (of things), affectionate, hearty (of people)